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Letters Patent No. 74,452, dated February 11, 1868. h i

IMPROVED APPARATUS FOR BOILING SAI AND OTHER LIQIDS.

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TO ALL WHOM IT MAY 4'CONCERNi Be it known that'I, JAMES S. THOMPSON, of Lyndon, in the county of Caledonia, and State of Vermont,

have invcnterlla new and improved Apparatus for Boiling Sap and other Liquids; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable othersskilled in the art to make and use' the same, reference being had to the accompanying drawings, forming part of this specification. I

This invention relates to a new and improved method of constructing apparatus for evuporating or boiling sap or other liquids, whereby the same is more clfectually and economically done. `It consists of a furnace and evnporating-pan, having a tube or tubes passing through said pan, s'o connected with the Hue that the heat is made to pass' through said tube or tubes before going out at the chimney. In,l the accompany-ing platdY of drawings- Y i Figure represents a plan view of my invention. Y i l Figure 2 represents a central longitudinal section of the same, taken in-the line :z: :u: fig. 1.

Similar letters of reference indica-te corresponding parts.

A is the furnace. B is a chamber in the flue F, communicating with th tube El C is the outer chamber in saiddue F, communicating with the other end of the tube E. E is a tube in the pan P, passing entirely around the same, and opening into the chambers B C. P isa metal `e-vaporating or boiling-pan. 'D is the damper. F, the line or chimney. G, pipes in the'furnace A, by which the tnbe'E is `connected withithe chambers B C in the uc F. 1

The furnace-A is constructed in the ordinary way. The-flue F isdivided into two chambers, B C. Into the chamber B there is au opening, Ofwhich, in any position of the damper D,-is in open communication with the tire in the furnace A. -Into said chambers B Cl there are fixed pipes, represented in the drawing, iu fig. 2, by G, upon which the tube Ein the pnnistted, one of said pipes being in therchamber B, and the other of 'said pipes being in the chamber C,.so that `one end of the tube E. is in communication with the chamherB, and

the other end of the tube E is invcommuuication with the chamber C. The damper D is made of two'plats, at right angles to each otheiyand is represented open in the drawing, the red lines indicating its position when shut.' Said damper is so arranged in vconnection with the flue F that, when open, as shown in the drawing, the

tine F is indirect communication with the tire in the. furnace A, but when said damper D is closed,.as represented by 'red lines, the passage a is closed, and the heat and smoke, stopped by the damper D,`pass through the opening O into the chamber B, and through the pipe E in the pan P, iu thedirect'iou shown by arrows in the drawing, through the tube E to the chamber Cinto the ue F.

The operation is such that, by means ofy the damper D, au open communication is left Vbetween. the re ini. the furnace A and the iue F, or the same is closed, and the heat made to pass through the tube E inthe pan 12 in which is placed the sap or other liquid to be boiled or evaporated. 1

The advantages of this improvement are, the 'greater radiating-surface which is thereby brought into contact with the :fluid to beboiled or evaporated, and the more perfect combustion and economical use of fuel.

' I claim as new, and. desire to, secure by Letters Patent f' I t The arrangement of the chambers -B C, and opening Oin the furnace A and iiue F, the` tube E, short pipes G, pan P, passage a, and right-angular damper D, as herein described, for the purpose specified.

The above specificationof my invention signed by me, thisurstday 'of October, 1867.

I JAMES THOMPSON.

Witnesses:

CHAs B. Danza, J. T. PALMER. 

